A/C Pressure Sensor

An electronic A/C pressure sensor is mounted to the line (between the condenser and the evaporator). The output to the powertrain control module is variable and is dependent upon pressure inside the line. A higher pressure results in a higher voltage out. The powertrain control module constantly monitors A/C system pressure to:

1. Disengage the A/C clutch if the pressures are too high, 2700 kPa (440 psi).
2. Disengage the A/C clutch if pressures are too low, below 285 kPa (38 psi).
3. Boost idle air control to compensate for A/C load at idle.
4. Control cooling fan operation. The pressure sensor is not repairable, if it fails, it must he replaced.